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I think it also depends on something else. When clearing an area with one hero (the army didn't change), identical groups of neutral creatures could be divided into 2 or 3 slots, or into 1 or 2 slots. Moreover, even a slightly smaller group could be divided into a larger number of slots. Perhaps this was due to the calculated strength being on the border, and the computer was rounding the result arbitrarily.
Техника в руках индейца мертва.
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html